Brass Compression Fittings
Compression fittings join copper, brass, or plastic tube without soldering, welding, or flaring: tightening the nut squeezes a ferrule (olive) onto the tube wall to create a leak-tight mechanical seal. Definite Metal manufactures brass compression fittings in Jamnagar, India, covering tube sizes from 4 mm to 25 mm (1/8″ to 1″ OD) with BSP or NPT threads. The range includes male and female connectors, round-body variants, bulkhead connectors, and bulkhead unions, machined from CW614N and forged from CW617N for OEM and bulk export buyers.
How Compression Sealing Works
Each fitting has three parts: a body, a nut, and a ferrule. The tube slides through the nut and ferrule into the body; as the nut is tightened, the ferrule is compressed between the nut and the tapered seat of the body and bites evenly into the tube surface. No heat, flux, or thread sealant is needed on the tube side, the joint can be dismantled for maintenance, and soft or thin-walled tube can be supported with an internal insert. This makes the compression principle a standard choice for water, gas, pneumatic, and instrumentation lines.
Types of Brass Compression Fittings We Manufacture
- Brass male connector — terminates a tube into a female-threaded port on a valve, manifold, or pump.
- Brass female connector — screws onto a male-threaded outlet and accepts the tube on the other end.
- Brass round male connector — a turned, cylindrical-body version of the male stud for compact assemblies.
- Brass female bulkhead — carries a tube connection through a panel or tank wall to a female thread.
- Brass bulkhead union — joins two tube runs through a panel, compression seal on both sides.
We also produce related lines: brass pipe fittings (threaded elbows, tees, nipples) and flare fitting parts for high-pressure and refrigeration work.
Size Range
| Tube OD (mm) | Nearest inch OD | Thread range (BSP / NPT) | Fitting types available |
|---|---|---|---|
| 4 | 5/32" | 1/8" | All types |
| 6 | 1/4" | 1/8", 1/4" | All types |
| 8 | 5/16" | 1/4" | All types |
| 10 | 3/8" | 1/4", 3/8" | All types |
| 12 | 1/2" | 3/8", 1/2" | All types |
| 15 | 5/8" | 1/2" | All types |
| 22 | 7/8" | 3/4" | Connectors, unions |
| 25 | 1" | 1" | Connectors, unions |
Inch tube sizes from 1/8″ to 1″ OD and intermediate metric sizes are produced against drawing or sample.
Materials — Brass Grades
All standard production uses brass, selected by manufacturing route:
| Grade | Standard | Typical composition | Used for |
|---|---|---|---|
| CW614N (CuZn39Pb3) | EN 12164/12165 | Cu 57–59%, Pb 2.5–3.5%, Zn balance | Free-machining bodies, nuts, ferrules turned from bar |
| CW617N (CuZn40Pb2) | EN 12165 | Cu 57–59%, Pb 1.6–2.5%, Zn balance | Hot-forged fitting bodies in larger sizes |
| IS 319 | Indian Standard | Leaded free-cutting brass | Cost-effective alternative where EN grades are not specified |
Also available in MS and SS 303/304/316 on request.
Finish Options
- Natural brass (self colour)
- Nickel plated
- Tin plated
- Chrome plated
Manufacturing & Export Capability
Custom manufacturing from drawing/sample · Tolerance ±0.01 mm · MOQ: 500 pcs · Lead time 1–2 weeks · ISO 9001:2015 · Export packing · FOB Mundra / CIF worldwide · Brass specialist in Jamnagar, India’s brass city
18+ years of manufacturing experience · 19 skilled workers · Sales@definitemetal.com
Applications & Industries
Brass compression fittings serve plumbing and heating installations, LPG and natural gas distribution, pneumatic and compressed-air systems, water treatment plants, and instrumentation lines in process industries. OEMs building boilers, gas appliances, medical gas equipment, and agricultural spraying machinery buy them in bulk as assembly components.
Frequently Asked Questions
Standard production covers 4 mm to 25 mm metric tube ODs and 1/8″ to 1″ inch tube ODs, with BSP or NPT threads from 1/8″ to 1″. Non-standard sizes are quoted against a drawing or sample.
Tightening the nut compresses a brass ferrule between the nut and the fitting body so it grips and seals against the tube wall. The joint needs no heat or adhesive and can be opened and remade during servicing.
We are a bulk and OEM manufacturer, not a retail seller, so MOQ depends on the item and size — share your requirement for confirmation. Production is certified to ISO 9001:2015, and material test reports plus RoHS declarations are available on request.
Yes. We ship to the USA, UK, Canada, Australia, the UAE, and across the EU with export-grade packing, on FOB Mundra or CIF terms as the buyer prefers.